Reenforced ring for pin-tumbler locks



M. C. MAXWELL.

REENFORCED RING FOR PIN TUMBLER LOCKS.

APPLICATION FILED JUNE 29. ml.

" 1,407,472, Patented Feb. 21, 1922.

FUNiT ED STATES arent.

FFICE.

MAXWELL C. MAXWELL, 0F STAMFORD, CONNECTICUT, ASSIG-NOR TO THE YALE & TOWNE MANUFACTURING COMPANY, OF STAMFORD, CONNECTICUT.

REENFORCED RING FOR PIN-TUMBLER LOCKS.

To all 20 [mm it may concern:

Be it known that I, MAXWELL C. MAXWELL, a citizen ofthe United States, and a resident of Stamford, in the county of F airfield and State of Connecticut, have invented certain new and useful Improvements in Reenforced Rings for Pin-Tumbler Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in reenforced rings for pin tumbler locks.

In the pin tumbler looks as universally used, the cylinder is provided at its outer end with a peripheral flange which rests against a metal ring interposed between said flange and the door to which the lock 13 applied, the ring having interlocklng connection with the door and cylinder of the lock whereby the cylinder will be prevented from turning in the ring. With such construction, if the ring be forcibly turned by a pipe wrench or other tool, the cylinder will turn with it and thus turn the key plug and the bar connecting the plug with the lock mechanism of the door and actuate the lock mechanism.

The object of my invention is to prevent the possible manipulation of the cylinder from the outer side of the door, and it consists in-a reenforced metal ring made of two ring members one resting on the other, the inner ring member only being connected to or interlocked with the door and cylinder, so that when attacked by a wrench or other tool, the outer ring section will turn and prevent any gripping action upon the inner ring section.

In the accompanying drawings, Figure 1 is a View in cross section of a part of door showing the lock applied thereto; Figure 2 is a view in front elevation of the same; Figure 3 is a view in section of the reenforced ring; Figure 4: is a view in rear elevation thereof; Figure 5 is a view in section at right angles to Figure 3 and Figures 6 and 7 are views in section of modified forms of rings.

10 represents the cylinder of a pin tumbler lock, provided at its outer end with a peripheral flange 11, and with a pin chamber 12 at the rear of the flange and extending longitudinally of the cylinder. The key Specification of Letters Patent. Patented Feb. 21, 1922. Application filed June 29,1921. Serial No. 481,276.

plug 13 is mounted to rotate in the cylinder and is connected by a bar 14 with the bolt mechanism of the lock 15 in the usual and well known manner, so that when the plug,

is turned, the connecting bar will be turned to actuate the bolt mechanism of the lock 15.

The reenforced cylinder ring is composed of two reenforcing ring members 16 and 17 and a sheet metal scalp 18 secured to the ring 17 and covering the periphery of rin 16 as shown in Figures 3, 5 and 7. In the construction shown in Figures 3 and 5 the peripheries of both rings 16 and 17 are beveled to prevent any gripping hold being obtained by a wrench, but the inner ring 16, or the ring which rests against the face of the door may have a right angle peripheral edge asshown in Figure 7.

The ring section 16 is preferably struck up from sheet metal and is provided at its top with the two integral toes or prongs 19,

of the cylinder 10, so that when the parts are assembled these toes or prongs will prevent the cylinder from turning in its seat in the door.

The outer ring section 17 is provided with a recessed seat to receive the flange 11 of the at its rear to the door in the well known manner, it will be seen that when the parts are assembled, the rings will be held against the outer face of the door by the peripheral flange 11 at the outer end of the cylinder 10.

By making the ring of two ring members which are disconnected in the sense that the outer one can turn on the inner one, it Will be seen that if a wrench be applied to the ring in an attempt to turn the cylinder, the outer ring section will turnon the inner section and prevent any gripping action upon the inner ring, which is the one which holds the ring against turning movement in the door.

In the construction shown in Figure 6, the inner ring member is made of cast malleable iron, the edge of which is overlapped by a wrought steel outer ring 17 the latter being preferably covered by a sheet metal scalp 18 With this latter construction the inner cylinder 10, and as the cylinder is secured ring member 16 is provided with an integral toe l9 projecting rearwardly and pointed so that it may enter a slot cut in the door, the toe being slotted to receive the upper edge of the pin chamber 12. of the cylinder and thus prevent the latter from being turned in the ring.

With these constructions it will be seen that the cylinder holds the ring members or sections against outward displacement or movement, and the inner member of the ring prevents the cylinder from turning, hence when theparts are assembled, any attemptto turn the cylinder by a wrench applied to the reenforced ring will result simply in the outer ring member turning upon the inner member, as the inner section is too thin to be directly engaged by a wrench, and this is particularly true when the outer edges of the ring sections are beveled. In the con struction shown in Figure 6 the inner ring,

section or member is overlapped by the outer member hence no part of the inner ring is exposed to which a wrench could possibly be applied.

' Having fully described my invention Whatv I claim as new and desire to secure by Letters-Patent, is

1. The combination of a cylinder lock having a flange at its outer end, and a reenforced ring made up of a plurality of separate rings the outer ring member being'engaged by the flange on the cylinder lock and free to turn on the inner ring member. I

2. The combination of a cylinder lock having a flange at its outer end, and a reenforced ring composed of a plurality of ring members the outer ring member being free to turn on the inner ring member and having a recessed seat to receive and house the flange on the cylinder lock. 7 y

3. The combination of a cylinder lock having a peripheral flange at its outer end, and a reenforced ring composed of two ring members the inner one of which is provided with projecting means engaging the door for preventing said memberfrom turning and also engaging the edge of the pin chamber of the cylinder lock for preventing the specification in the latter from turning, and the other or outer ring member being engaged by the flange on the cylinder and free to turn on the inner the cylinder lock and free to'turn on the inner. ring member.

5. The combination of a cylinder lock having a peripheral flange at its outer end,-

member and overlapping the other ring member, the inner ring member having means to engage the door whereby .it will be prevented from turning and also provided with a recessed seat to receive the free edge of the pin chamber of the cylinder lock, and

the other or outer member having a recessed seat to receive the flange on-the cylinder lock.

and free to turn on the inner ring member.

6. The combination of a cylinder lock having a peripheral flange at'its outer end and a reenforced ring composed of two ring memand a reentorced ring composed of two ring members and a scalp secured to one rlng bers each having a beveled periphery, the in;

ner ring member having projecting means engaging the door for preventing the ring from turmng and alsohavlng means engaging the free edge of the pin chamber of the cylinder lock for preventing the latter from turning in the ring, and the outer ring member forming a seat for the flange on'the cylinder lock, the outer ring member being free to turn on the inner ring member.

In testimony whereof, I have signed this ing witnesses.

MAXWELL CL MAXWELL.

Witnesses: l

MARGARET SARSFIELD, CHAS. A. BERRY.

presence of two subscrib- 

